BY-COVID - WP5 - Baseline Use Case: COVID-19 vaccine effectiveness assessment

Descriptive analyses

Periods

Period Time range
Data extraction period 2020-03-05 - 2022-05-20
Enrollment period 2021-01-01 - 2021-08-31
Study period 2021-01-01 - 2022-08-31

Study population and enrollment

Description of the study population: table 1

Table 1
Intervention group
(N=4730)
Control group
(N=4730)
P-value

ᵃ5-year age groups

sex_cd
Mean (SD) 1.47 (0.536) 1.46 (0.546) 0.246
Median [Min, Max] 1.00 [0, 2.00] 1.00 [0, 2.00]
age_cdᵃ
Mean (SD) 11.7 (2.95) 11.7 (2.98) 0.771
Median [Min, Max] 12.0 [2.00, 18.0] 12.0 [2.00, 18.0]
residence_area_cd
731 643 (13.6%) 658 (13.9%) 0.358
732 692 (14.6%) 644 (13.6%)
733 3395 (71.8%) 3428 (72.5%)
institutionalized_bl
Yes 128 (2.7%) 120 (2.5%) 0.652
No 4602 (97.3%) 4610 (97.5%)
foreign_bl
Yes 711 (15.0%) 708 (15.0%) 0.954
No 4019 (85.0%) 4022 (85.0%)
pregnancy_bl
Yes 55 (1.2%) 44 (0.9%) 0.312
No 4675 (98.8%) 4686 (99.1%)
essential_worker_bl
Yes 127 (2.7%) 129 (2.7%) 0.949
No 4603 (97.3%) 4601 (97.3%)
comorbidities_bl
Yes 2154 (45.5%) 2146 (45.4%) 0.885
No 2576 (54.5%) 2584 (54.6%)
immunestatus_bl
Yes 1302 (27.5%) 1305 (27.6%) 0.963
No 3428 (72.5%) 3425 (72.4%)

Tables

The individuals in the imported dataset are counted by ‘fully_vaccinated_bl’ and ‘confirmed_case_bl’.

Not completed a primary vaccination schedule Completed a primary vaccination schedule Total
No confirmed case 639 6010 6649
Confirmed case 361 2990 3351
Total 1000 9000 10000

Ratio = \(\frac{(\frac{confirmed \ cases}{non-vaccinated \ individuals})} {(\frac{confirmed \ cases}{vaccinated \ individuals})}\) = 0.9202832

The individuals eligible for analysis are counted by ‘fully_vaccinated_bl’ and ‘confirmed_case_bl’.

Not completed a primary vaccination schedule Completed a primary vaccination schedule Total
No confirmed case 620 5739 6359
Confirmed case 329 2639 2968
Total 949 8378 9327

Ratio = \(\frac{(\frac{confirmed \ cases}{non-vaccinated \ individuals})} {(\frac{confirmed \ cases}{vaccinated \ individuals})}\) = 0.9085929

The matched individuals are counted by ‘fully_vaccinated_bl’ and ‘confirmed_case_bl’.

Not completed a primary vaccination schedule Completed a primary vaccination schedule Total
No confirmed case 309 4576 4885
Confirmed case 155 1974 2129
Total 464 6550 7014

Ratio = \(\frac{(\frac{confirmed \ cases}{non-vaccinated \ individuals})} {(\frac{confirmed \ cases}{vaccinated \ individuals})}\) = 0.9021778